/**
 * Copyright (c) 2015-2018, Golly Hu 胡高 (3722711@qq.com).
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.hg.jfsa.core.option;

import cn.hg.base.jfinal.directive.BaseDirective;
import cn.hg.base.jfinal.directive.annotation.JfsaDirective;
import com.jfinal.kit.StrKit;
import com.jfinal.template.Env;
import com.jfinal.template.TemplateException;
import com.jfinal.template.io.Writer;
import com.jfinal.template.stat.Scope;

import java.io.IOException;

/**
 * @author Golly
 *
 */
@JfsaDirective("option")
public class OptionDirective extends BaseDirective {

	public void onRender(Env env, Scope scope, Writer writer) {

		String key = getPara(0, scope);
		if (StrKit.isBlank(key)) {
			throw new IllegalArgumentException("#option(...) argument must not be empty");
		}

		String defaultValue = getPara(1, scope, "");

		String value = Options.get(key);
		if (value == null || value == "") {
			value = defaultValue;
		}

		try {
			writer.write(value);
		} catch (IOException e) {
			throw new TemplateException(e.getMessage(), location, e);
		}
	}
}
